Three-phase permanent-magnet linear motor octupole nine-slot stator winding

Abstract

The invention discloses a three-phase permanent-magnet linear motor octupole nine-slot stator winding which is characterized in that the three-phase permanent-magnet linear motor octupole nine-slot stator winding comprises a stator winding which is of an octupole nine-slot winding structure in a fractional-slot concentrated winding; the stator winding is composed of a plurality of stator winding units connected in series; each stator winding unit includes nine toothed slots; the winding units are embedded into the toothed slots according to certain rules and are connected in series according to the phase; double winding units are embedded into each toothed slot; and the length of each stator winding unit corresponds to four pairs of poles of a three-phase permanent-magnet linear motor rotor. The stator winding has a simple structure, and the manufacturing process is simple. The slot filling factor is improved; the output of the three-phase permanent-magnet linear motor is increased; the efficiency of the motor is improved; the back electromotive force waveform is good; the cogging torque and torque ripple are reduced; smooth operation of the three-phase permanent-magnet linear motor is ensured; the vibration of the motor is weakened; and the failure rate of the motor is reduced.

Description

technical field [0001] The invention relates to the technical field of eight-pole and nine-slot stator windings of a three-phase permanent-magnet linear motor, and is particularly applicable to a three-phase permanent-magnet linear motor for oil extraction. Background technique [0002] Traditional oil pumping equipment is mainly beam pumping unit, and the whole set of equipment is divided into surface and underground. Due to the complex and changeable conditions of the oil well, the weight of the pumping unit, large floor area, many faults and low efficiency have become very obvious. It is difficult for the sucker rod of this kind of oil pumping equipment to keep parallel to the axis of the oil pipe during the up and down reciprocating movement, especially in inclined wells. The resulting eccentric wear of the rod and pipe, resulting in pipe leakage, rod breakage and other problems have caused great problems. economic loss. In addition, the submersible linear motor uses a...

AI Technical Summary

Problems solved by technology

Due to the complex and changeable conditions of the oil well, the weight of this pumping unit, large floor area, many faults, and the shortcomings of low efficiency have become very obvious.

It is difficult for the sucker rod of this kind of oil pumping equipment to keep parallel to the axis of the oil pipe during the up and down reciprocating movement, especially in inclined wells. The resulting eccentric wear of the rod and pipe, resulting in pipe leakage, rod breakage and other problems have caused great problems. economic loss

In addition, the submersible linear motor uses an integer slot winding, the back EMF waveform is poor, and the current waveform is distorted, causing positioning torque and torque ripple, which reduces the stability of the motor output

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